In "Sex at Dawn," authors Christopher Ryan and Cacilda Jethá embark on a revolutionary journey that challenges the conventional wisdom surrounding human sexuality and relationships. With an engaging blend of anthropology, archaeology, primatology, and more, they dismantle the deeply ingrained belief that sexual monogamy is natural to our species. Instead, they present a compelling argument that humans evolved in egalitarian groups where sharing was the norm, including sexual partners. This groundbreaking book not only questions the societal and scientific narratives we've been fed but also illuminates the rich tapestry of human sexual history through evidence long ignored or unseen. Through a meticulous examination of diverse fields, Ryan and Jethá reveal how modern struggles with fidelity, sexual orientation, and family dynamics are deeply rooted in our promiscuous past. "Sex at Dawn" explores why passion fades, why affairs are so common, and what our bodies can tell us about the ancient origins of modern sexuality. With a mix of humor, insight, and daring, the authors guide us towards a more optimistic future, suggesting that understanding our innate capacities for love, cooperation, and generosity could reshape our relationships and societies. This book is a bold invitation to rethink everything we thought we knew about sex, love, and human nature, making it a crucial read for anyone seeking to understand the complexities of human intimacy and connection.